Institution
Woods Hole Oceanographic Institution
Nonprofit•Falmouth, Massachusetts, United States•
About: Woods Hole Oceanographic Institution is a nonprofit organization based out in Falmouth, Massachusetts, United States. It is known for research contribution in the topics: Population & Mantle (geology). The organization has 5685 authors who have published 18396 publications receiving 1202050 citations. The organization is also known as: WHOI.
Papers published on a yearly basis
Papers
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TL;DR: In this article, a recent extension of sliding mode control is shown to handle nonlinearities, is highly robust to imprecise models, explicitly accounts for the presence of high-frequency unmodeled dynamics, and produces designs that are easy to understand.
Abstract: underwater vehicles present difficult control-system design problems due to their nonlinear dynamics, uncertain models, and the presence of disturbances that are difficult to measure or estimate. In this paper, a recent extension of sliding mode control is shown to handle these problems effectively. The method deals directly with nonlinearities, is highly robust to imprecise models, explicitly accounts for the presence of high-frequency unmodeled dynamics, and produces designs that are easy to understand. Using a nonlinear vehicle simulation, the relationship between model uncertainty and performance is examined. The results show that adequate controllers can be designed using simple nonlinear models, but that performance improves as model uncertainty is decreased and the improvements can be predicted quantitatively.
513 citations
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TL;DR: In this paper, the determination of total nitrogen in aqueous samples after potassium persulfate digestion compared favorably in both precision and nitrogen recovery with determinations obtained using Kjeldahl digestion.
Abstract: Determination of total nitrogen in aqueous samples after potassium persulfate digestion compared favorably in both precision and nitrogen recovery with determinations obtained using Kjeldahl digestion.
512 citations
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TL;DR: In this paper, the differences between temporal variability in terrestrial and marine environments and how this external forcing may affect population fluctuations in the two systems are reviewed and the internal dynamics and community responses are expected to differ significantly.
Abstract: I review here the differences between temporal variability in terrestrial and marine environments and consider how this external forcing may affect population fluctuations in the two systems. The internal dynamics and community responses are expected to differ significantly with marine populations more likely to show longer term changes between alternative community structures.
511 citations
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TL;DR: The induction, by phosphorus stress, of genes from the Trichodesmium erythraeum IMS101 genome that are predicted to encode proteins associated with the high-affinity transport and hydrolysis of phosphonate compounds by a carbon–phosphorus lyase pathway are described.
Abstract: The factors that control the growth and nitrogen fixation rates of marine diazotrophs such as Trichodesmium have been intensively studied because of the role that these processes have in the global cycling of carbon and nitrogen, and in the sequestration of carbon to the deep sea. Because the phosphate concentrations of many ocean gyres are low, the bioavailability of the larger, chemically heterogeneous pool of dissolved organic phosphorus could markedly influence Trichodesmium physiology. Here we describe the induction, by phosphorus stress, of genes from the Trichodesmium erythraeum IMS101 genome that are predicted to encode proteins associated with the high-affinity transport and hydrolysis of phosphonate compounds by a carbon-phosphorus lyase pathway. We show the importance of these genes through expression analyses with T. erythraeum from the Sargasso Sea. Phosphonates are known to be present in oligotrophic marine systems, but have not previously been considered to be bioavailable to marine diazotrophs. The apparent absence of genes encoding a carbon-phosphorus lyase pathway in the other marine cyanobacterial genomes suggests that, relative to other phytoplankton, Trichodesmium is uniquely adapted for scavenging phosphorus from organic sources. This adaptation may help to explain the prevalence of Trichodesmium in low phosphate, oligotrophic systems.
509 citations
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TL;DR: The isolation of cyanophages that infect Prochlorococcus is reported, and it is hypothesized that gradients in cyanobacterial population diversity, growth rates, and/or the incidence of lysogeny underlie these trends.
Abstract: Prochlorococcus is the numerically dominant phototroph in the tropical and subtropical oceans, accounting for half of the photosynthetic biomass in some areas1,2. Here we report the isolation of cyanophages that infect Prochlorococcus, and show that although some are host-strain-specific, others cross-infect with closely related marine Synechococcus as well as between high-light- and low-light-adapted Prochlorococcus isolates, suggesting a mechanism for horizontal gene transfer. High-light-adapted Prochlorococcus hosts yielded Podoviridae exclusively, which were extremely host-specific, whereas low-light-adapted Prochlorococcus and all strains of Synechococcus yielded primarily Myoviridae, which has a broad host range. Finally, both Prochlorococcus and Synechococcus strain-specific cyanophage titres were low ( 105 cells ml-1). These low titres in areas of high total host cell abundance seem to be a feature of open ocean ecosystems. We hypothesize that gradients in cyanobacterial population diversity, growth rates, and/or the incidence of lysogeny underlie these trends.
508 citations
Authors
Showing all 5752 results
Name | H-index | Papers | Citations |
---|---|---|---|
Roberto Romero | 151 | 1516 | 108321 |
Jerry M. Melillo | 134 | 383 | 68894 |
Timothy J. Mitchison | 133 | 404 | 66418 |
Xiaoou Tang | 132 | 553 | 94555 |
Jillian F. Banfield | 127 | 562 | 60687 |
Matthew Jones | 125 | 1161 | 96909 |
Rodolfo R. Llinás | 120 | 386 | 52828 |
Ronald D. Vale | 117 | 342 | 49020 |
Scott C. Doney | 111 | 406 | 59218 |
Alan G. Marshall | 107 | 1060 | 46904 |
Peter K. Smith | 107 | 855 | 49174 |
Donald E. Canfield | 105 | 298 | 43270 |
Edward F. DeLong | 102 | 262 | 42794 |
Eric A. Davidson | 101 | 281 | 45511 |
Gary G. Borisy | 101 | 248 | 38195 |